blank holder die

Abstract

This application discloses a blank holder die, comprising: an upper die assembly, a lower die assembly, a blank holder ring, a sliding assembly, and a force-applying component; the lower die assembly is correspondingly disposed below the upper die assembly; the blank holder ring is vertically and movably disposed between the upper and lower die assemblies, and the blank holder ring has a first guide surface facing away from the upper die assembly; the sliding assembly is horizontally slidably disposed on the lower die assembly, and the sliding assembly has a second guide surface, which slides in cooperation with the first guide surface, so that when the blank holder ring is pressed down by the upper die assembly and descends, the vertical downward pressure is converted into a driving force to drive the sliding assembly to slide horizontally; the force-applying component is disposed on the lower die assembly and is used to provide a supporting force to the sliding assembly to resist the driving force, thereby providing the required blank holder force for the blank holder ring. The blank holder die of this application can reduce the space occupied in the die height direction and optimize the die design structure.

Description

Technical Field

[0001] This application relates to the field of stamping die technology, and in particular to a blank holder die. Background Technology

[0002] In related technologies, particularly in the cold stamping metal forming field, especially in the drawing process of automotive body panels, the demand for blank holder force at the bottom of the blank holder ring is increasing due to the widespread application of high-strength steel. Currently, the industry commonly uses nitrogen springs or ejector pins as force-amplifying elements at the bottom to meet the pressure requirements of metal forming. However, with the continuous development of higher-strength steels, the force required for forming has increased dramatically. Traditional nitrogen springs or ejector pins, in order to achieve the required enormous forming force, have also significantly increased in size and installation height. This directly leads to a severe shortage of design space at the bottom of the mold, not only increasing the manufacturing cost and complexity of the mold but also limiting the optimal design of the mold structure. Summary of the Invention

[0003] This invention aims to at least solve one of the technical problems existing in the prior art. To this end, this application proposes a method that can reduce the space occupied in the height direction of the mold and optimize the design structure of the mold.

[0004] According to an embodiment of the present invention, a blanking die includes: an upper die assembly, a lower die assembly, a blanking ring, a sliding assembly, and a force-applying component; the lower die assembly is correspondingly disposed below the upper die assembly; the blanking ring is vertically disposed between the upper die assembly and the lower die assembly, and the blanking ring has a first guide surface facing away from the upper die assembly; the sliding assembly is horizontally slidably disposed on the lower die assembly, and the sliding assembly has a second guide surface, which slides in cooperation with the first guide surface, so that when the blanking ring is pressed down by the upper die assembly and descends, the vertical downward pressure is converted into a driving force to drive the sliding assembly to slide horizontally; the force-applying component is disposed on the lower die assembly and is used to provide a supporting force to the sliding assembly to resist the driving force, so as to provide the blanking ring with the required blanking force.

[0005] According to the embodiments of the present invention, the blanking die has at least the following beneficial effects: the blanking die includes an upper die assembly and a lower die assembly distributed vertically, with a blanking ring provided between the upper die assembly and the lower die assembly. The lower die assembly is further provided with a sliding component and a force-applying component. In use, the upper die assembly moves downward and abuts against the blanking ring through the edge of the workpiece. The blanking ring is then pressed downward. The side of the blanking ring facing away from the upper die assembly is provided with a first guide surface. The second guide surface of the sliding component can slide horizontally under the abutment of the first guide surface, thereby converting the vertical movement of the blanking ring into the horizontal sliding of the sliding component. This converts the large downward pressure of the upper die assembly into a driving force for driving the horizontal movement of the sliding component. At the same time, a force-applying component is provided on one side of the sliding component. The force-applying component can apply a horizontal supporting force to the sliding component to resist the driving force of the blanking ring driving the sliding component to slide horizontally. Therefore, the force-applying component can be horizontally or inclinedly arranged on one side of the sliding component, thereby reducing the height required by the force-applying component in the vertical direction, reserving more design space for the lower die assembly, and reducing the manufacturing cost and complexity of the lower die assembly.

[0006] According to some embodiments of the present invention, the first guide surface and the second guide surface are both inclined planes that can cooperate with each other, and the angle between the inclined plane and the horizontal plane is less than 45°.

[0007] According to some embodiments of the present invention, a first guide member is further included. The first guide member is disposed on a first guide surface or a second guide surface and is located between the sliding assembly and the pressure ring to reduce the friction between the sliding assembly and the pressure ring.

[0008] According to some embodiments of the present invention, a second guide member is further included, which is disposed between the bottom of the sliding assembly and the lower module to reduce friction between the bottom of the sliding assembly and the lower module.

[0009] According to some embodiments of the present invention, the first guide slide and the second guide slide are both made of copper, the sliding assembly and the pressure ring are both made of steel, and the included angle between the inclined plane and the horizontal plane is in the range of 30°-35°.

[0010] According to some embodiments of the present invention, multiple sets of force-applying components and slider assemblies are provided in a one-to-one correspondence, and multiple sets of slider assemblies are distributed at intervals below the pressure ring, with the force-applying component located on the side of the slider assembly away from the center line of the pressure ring.

[0011] According to some embodiments of the present invention, a limiting member is also included, which is fixed to the lower module and located on the side of the sliding assembly away from the force-applying member, and is used to limit the extreme position of the sliding assembly to be reset under the action of the force-applying member.

[0012] According to some embodiments of the present invention, the pressure ring is provided with a guide hole extending in the vertical direction, and the lower module is provided with a guide post adapted to the guide hole, the guide post being slidably inserted through the guide hole.

[0013] According to some embodiments of the present invention, a guide rail is also included, which is disposed in the lower module for guiding the horizontal movement of the sliding component.

[0014] According to some embodiments of the present invention, the force-applying component is an elastic component, a pneumatic component, or a hydraulic component. Attached Figure Description

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein: Figure 1 This is a schematic diagram of the pressing die of the present invention; Figure 2 for Figure 1 A cross-sectional view of the blank holder die shown; Figure 3 for Figure 2 A magnified view of a portion at point A shown in the image; Figure 4 for Figure 1 The diagram shows a force analysis of the blank holder ring and sliding assembly in the blank holder die.

[0016] Figure label: Upper module 100; upper mold core 110; lower module 200; lower mold core 210; lower mold base 220; guide rail 230; pressure ring 300; first guide surface 301; sliding component 400; second guide surface 401; force application component 500; nitrogen spring 510; mounting base 520; limiting component 600; first guide slide 710; second guide slide 720. Detailed Implementation

[0017] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0018] In the description of this application, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0019] In the description of this application, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0020] In the description of this application, unless otherwise expressly defined, terms such as "setup," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this application in conjunction with the specific content of the technical solution.

[0021] In the description of this application, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0022] The following is for reference. Figures 1 to 4 The pressing die of an embodiment of the present invention is described.

[0023] like Figures 1 to 3 As shown, the blanking die according to an embodiment of the present invention includes: an upper die 100, a lower die 200, a blanking ring 300, a sliding assembly 400, and a force-applying member 500; the lower die 200 is correspondingly disposed below the upper die 100; the blanking ring 300 is vertically disposed between the upper die 100 and the lower die 200, and the blanking ring 300 is provided with a first guide surface 301 facing away from the upper die 100; the sliding assembly 400 is horizontally slidably disposed on the lower die 200, and the sliding assembly 400 is provided with a second guide surface 401, which is slidably engaged with the first guide surface 301, so that when the blanking ring 300 is pressed down by the upper die 100 and descends, the vertical downward pressure is converted into a driving force to drive the sliding assembly 400 to slide horizontally; the force-applying member 500 is disposed on the lower die 200 and is used to provide a supporting force to the sliding assembly 400 to resist the driving force, so as to provide the blanking ring 300 with the required blanking force.

[0024] Understandably, this type of blank holder die includes an upper die assembly 100 and a lower die assembly 200 distributed vertically. A blank holder ring 300 is provided between the upper die assembly 100 and the lower die assembly 200. The lower die assembly 200 also includes a sliding component 400 and a force-applying component 500. In use, the upper die assembly 100 moves downward and abuts against the blank holder ring 300 through the edge of the workpiece. The blank holder ring 300 is then pressed downward. The side of the blank holder ring 300 facing away from the upper die assembly 100 has a first guide surface 301. The second guide surface 401 of the sliding component 400 can slide horizontally under the abutment of the first guide surface 301, thereby converting the vertical movement of the blank holder ring 300 into the sliding component 400. The horizontal sliding of the upper module 100 can convert the large downward pressure of the upper module 100 into a driving force to drive the horizontal movement of the sliding component 400. At the same time, a force-applying member 500 is provided on one side of the sliding component 400. The force-applying member 500 can apply a horizontal support force to the sliding component 400 to resist the driving force of the pressure ring 300 to drive the sliding component 400 to slide horizontally. Therefore, the force-applying member 500 can be set horizontally or inclined on one side of the sliding component 400, thereby reducing the height required by the force-applying member 500 in the vertical direction, reserving more design space for the lower module 200, and also reducing the manufacturing cost and complexity of the lower module 200.

[0025] When the force-applying component 500 is a nitrogen spring 510, the nitrogen spring 510 can be installed horizontally in the lower mold base 220 of the lower mold assembly 200, or installed obliquely in the lower mold base 220 of the lower mold assembly 200. This avoids excessive space occupation in the mold height direction caused by vertical installation of the nitrogen spring 510, thereby reducing the mold manufacturing cost and optimizing the mold structural design.

[0026] It is understood that both the first guide surface 301 and the second guide surface 401 are inclined planes that can cooperate with each other, and the angle between the inclined plane and the horizontal plane is less than 45°. For example, as Figures 1 to 4 As shown, in this embodiment, both the first guide surface 301 of the pressure ring 300 and the second guide surface 401 of the sliding component 400 can be inclined planes. Therefore, during the vertical descent of the pressure ring 300, the mutual abutment of the first guide surface 301 and the second guide surface 401 converts the downward pressure of the upper module 100 into a horizontal driving force on the sliding component 400. The force-applying component 500 supports the sliding component 400 to resist the driving force, thus achieving a change in force direction. Especially when the angle between the inclined plane and the horizontal plane is less than 45 degrees, the horizontal supporting force of the nitrogen spring 510 required by the sliding component 400 is less than the downward pressure of the upper module 100, thereby achieving a labor-saving effect.

[0027] Specifically, the upper mold assembly 100 includes an upper mold base (not shown in the figure) and an upper mold core 110 located at the bottom of the upper mold base, and the lower mold assembly 200 includes a lower mold base 220 and a lower mold core 210 located on the upper part of the lower mold base 220. To ensure that the pressure ring 300 can move vertically along the mold opening and closing direction, a guide structure is provided between the lower mold base 220 and the pressure ring 300, thereby ensuring the linearity of the lifting and lowering of the pressure ring 300. This also ensures that when the pressure ring 300 is subjected to a supporting force from the sliding component 400 perpendicular to the inclined plane, the lower mold base 220 provides an equal and opposite force to the pressure ring 300, thus ensuring that the pressure ring 300 always moves vertically.

[0028] Specifically, the conclusion that an inclination angle θ < 45° between the inclined plane and the horizontal plane can save effort can be obtained by performing force analysis on the slider and the pressure ring 300 separately. First, performing force analysis on the pressure ring 300 (considering an ideal state, ignoring its own weight and friction), the pressure ring 300 will be subjected to the downward vertical pressure (i.e., forming force) F11 from the upper mold base, the supporting force F10 from the sliding component 400 along the normal direction of the inclined plane, and the horizontal thrust F12 from the guide structure between the lower mold base 220 and the pressure ring 300. When the pressure ring 300 is pressed down to its lowest position, the pressure ring 300 is in vertical force balance, therefore the forming force F11 = F10 * Cosθ.

[0029] Force analysis of the sliding component 400 reveals that it is subjected to a normal force F20 from the pressure ring 300 perpendicular to the inclined plane (this force is an interaction force with F10, therefore F20 = F10), a supporting force F21 from the lower mold base 220, and a horizontal supporting force F22 from the force-applying component 500. When the pressure ring 300 is pressed down to its lowest point, the sliding component 400 is in horizontal equilibrium, therefore F22 = F20 * Sinθ. Since F20 = F10, F11 / Cosθ = F22 / Sinθ, or F22 = F11 * tanθ. In other words, the horizontal force exerted by the force-applying component 500 on the sliding component 400 has a tangent relationship with the forming force exerted by the upper mold 100. Therefore, when the force-applying component 500 only needs to provide a small forming force to meet the requirements, θ needs to be less than 45°. This ensures that the horizontal force applied by the force-applying component 500 to the sliding assembly 400 is less than the forming force exerted by the upper mold 100. Especially when the force-applying component 500 is a nitrogen spring 510, the smaller the supporting force required from the force-applying component, the smaller the volume of the nitrogen spring 510 can be designed, thereby further reducing the space occupied by the pressure die and optimizing the die structure.

[0030] It should be understood that, apart from the embodiments in which the first guide surface 301 and the second guide surface 401 are both inclined planes, in some other embodiments, the first guide surface 301 and the second guide surface 401 can also be guide curved surfaces, as long as it can realize the conversion of the vertical displacement of the pressure ring 300 into the horizontal displacement of the sliding component 400.

[0031] It is understood that a first guide member 710 is also included. The first guide member 710 is disposed on the first guide surface 301 or the second guide surface 401 and is located between the sliding assembly 400 and the pressure ring 300 to reduce the friction between the sliding assembly 400 and the pressure ring 300. For example, as Figure 3 As shown, in this embodiment, by providing a first guide slide 710 between the first guide surface 301 and the second guide surface 401, the friction between the two is reduced, and the smoothness of the use process is improved; at the same time, the wear between the pressure ring 300 and the sliding component 400 is reduced, which can also improve the service life of the mold.

[0032] It is understood that a second guide member 720 is also included, which is disposed between the bottom of the sliding assembly 400 and the lower module 200 to reduce friction between the bottom of the sliding assembly 400 and the lower module 200. For example, as Figure 3 As shown, in this embodiment, by providing a second guide slide between the bottom of the sliding component 400 and the lower module 200, the friction between the two is reduced, and the smoothness of the use process is improved; at the same time, reducing the wear between the bottom of the sliding component 400 and the lower module 200 can also improve the service life of the mold.

[0033] It is understandable that the first guide slide 710 and the second guide slide 720 are both made of copper, while the sliding assembly 400 and the pressure ring 300 are both made of steel. The angle between the inclined plane and the horizontal plane ranges from 30° to 35°. For example, as... Figure 3 As shown, in this embodiment, since there will inevitably be sliding friction between the sliding component 400 and the lower module 200 at the bottom during actual use, let the coefficient of friction be μ. When it is necessary to push the sliding component 400 to move horizontally, the component of the normal force of the pressure ring 300 on the slider in the horizontal direction (i.e., F20 * Sinθ) needs to be greater than the normal force of the bottom of the sliding component 400 and the lower module * the coefficient of friction (i.e., F21 * Cosθ * μ). Therefore, F20 * Sinθ > F21 * Cosθ * μ, that is, the condition that θ needs to satisfy is tanθ > μ, and θ needs to be greater than arctanμ. That is, when θ is less than or equal to arctanμ, the sliding component 400 cannot slide, thus causing a self-locking phenomenon.

[0034] Specifically, in this embodiment, when the first guide slide 710 and the second guide slide 720 are both made of copper, and the sliding assembly 400 and the pressure ring 300 are both made of steel, the angle θ between the inclined plane and the horizontal plane ranges from 30° to 35°. This avoids self-locking and reduces the support force required by the force-applying component 500. Furthermore, since the relationship between the distance Z from which the pressure ring 300 descends after contacting the sliding assembly 400 and the distance X from which the sliding assembly 400 moves horizontally is Z / X = tanθ, when Z is constant, θ is less than 45°. The smaller θ is, the larger X is, resulting in a larger horizontal movement of the sliding assembly 400 and thus a larger horizontal space occupation of the mold. Therefore, considering the above factors, a value of θ between 30° and 35° avoids self-locking, reduces the support force required by the force-applying component 500, and also reduces the horizontal space occupation of the lower mold.

[0035] It is understandable that multiple sets of force-applying components 500 and slider assemblies are provided in a one-to-one correspondence, and multiple sets of sliding assemblies 400 are distributed at intervals below the pressure ring 300. The force-applying components 500 are located on the side of the sliding assembly 400 opposite to the center line of the pressure ring 300. For example, as... Figure 2 As shown, in this embodiment, by arranging multiple sets of sliding components 400 and force-applying components 500 at intervals below the pressure ring 300, a relatively uniform supporting force can be provided around the pressure ring 300. The force-applying component 500 is located on the side of the sliding component 400 away from the center line of the pressure ring 300, which also facilitates the setting of the force-applying component 500 in the lower module 200 and avoids interference between the force-applying component 500 and the components in the lower module.

[0036] It is understood that a limiting member 600 is also included. The limiting member 600 is fixed to the lower module 200 and located on the side of the sliding assembly 400 opposite to the force-applying member 500, and is used to limit the extreme positions of the sliding assembly 400's reset under the action of the force-applying member 500. For example, as... Figure 3 As shown, in this embodiment, after the pressure ring 300 moves upward, the sliding component 400 can be reset under the action of the force-applying component 500. In order to prevent the sliding component 400 from sliding and damaging other components in the lower module 200 under the action of the force-applying component 500, a limiting component 600 is set at the limit position of the reset to limit the sliding distance of the sliding component 400.

[0037] It is understood that the pressure ring 300 is provided with a guide hole extending in the vertical direction, and the lower module 200 is provided with a guide post that matches the guide hole, the guide post being slidably inserted into the guide hole. For example, in this embodiment, by providing a vertical guide post in the lower module 200, it can slide and engage with the guide hole of the pressure ring 300, thereby improving the linearity of the vertical movement of the pressure ring 300.

[0038] Understandably, it also includes a guide rail 230, which is located in the lower module 200 to guide the horizontal movement of the sliding assembly 400. For example, as Figure 3 As shown, in this embodiment, the guide rail 230 provided by the lower module 200 can improve the linearity of the horizontal movement of the sliding component 400, thereby improving the effectiveness of converting the horizontal support force of the force-applying component 500 into the vertical support force of the pressure ring 300.

[0039] It is understandable that the force-applying component 500 is an elastic component, a pneumatic component, or a hydraulic component. For example, such as... Figures 1 to 3 As shown, in this embodiment, the force-applying component 500 can be an elastic component, such as a helical spring or a nitrogen spring 510; it can be a pneumatic component, such as a cylinder; or it can be a hydraulic component, such as a hydraulic cylinder. It only needs to provide horizontal support to the sliding assembly 400 to resist the horizontal component force exerted on the sliding assembly 400 by the pressure ring 300.

[0040] The embodiments of this application have been described in detail above with reference to the accompanying drawings. However, this application is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of this application. Furthermore, unless otherwise specified, the embodiments and features described in the embodiments of this application can be combined with each other.

Claims

1. A blank holder die, characterized in that, include: Upper module (100); The lower module (200) is located below the upper module (100); A pressure ring (300) is vertically disposed between the upper module (100) and the lower module (200), and the pressure ring (300) is provided with a first guide surface (301) facing away from the upper module (100). A sliding component (400) is slidably disposed on the lower module (200). The sliding component (400) is provided with a second guide surface (401). The second guide surface (401) is slidably engaged with the first guide surface (301) so that when the pressure ring (300) is pressed down by the upper module (100) and descends, the vertical downward pressure is converted into a driving force to drive the sliding component (400) to slide horizontally. A force-applying component (500) is provided on the lower module (200) and is used to provide a supporting force to the sliding assembly (400) to resist the driving force, so as to provide the required pressing force to the pressing ring (300).

2. The blank holder die according to claim 1, characterized in that, The first guide surface (301) and the second guide surface (401) are both inclined planes that can cooperate with each other, and the angle between the inclined plane and the horizontal plane is less than 45°.

3. The blank holder die according to claim 2, characterized in that, It also includes a first guide (710), which is disposed on the first guide surface (301) or the second guide surface (401) and located between the sliding assembly (400) and the pressure ring (300) to reduce the friction between the sliding assembly (400) and the pressure ring (300).

4. The blank holder die according to claim 3, characterized in that, It also includes a second guide (720) disposed between the bottom of the sliding assembly (400) and the lower module (200) to reduce friction between the bottom of the sliding assembly (400) and the lower module (200).

5. The blank holder die according to claim 4, characterized in that, The first guide slide (710) and the second guide slide (720) are both made of copper, the sliding assembly (400) and the pressure ring (300) are both made of steel, and the angle between the inclined plane and the horizontal plane is in the range of 30°-35°.

6. The blank holder die according to claim 1, characterized in that, Multiple sets of force-applying components (500) are provided in a one-to-one correspondence with the slider assembly. Multiple sets of slider assemblies (400) are distributed at intervals below the pressure ring (300). The force-applying component (500) is located on the side of the slider assembly (400) away from the center line of the pressure ring (300).

7. The blank holder die according to claim 1, characterized in that, It also includes a limiting member (600), which is fixed to the lower module (200) and located on the side of the sliding assembly (400) away from the force-applying member (500), and is used to limit the extreme position of the sliding assembly (400) under the action of the force-applying member (500).

8. The blank holder die according to claim 1, characterized in that, The pressure ring (300) is provided with a guide hole extending in the vertical direction, and the lower module (200) is provided with a guide post adapted to the guide hole, and the guide post is slidably inserted through the guide hole.

9. The blank holder die according to claim 1, characterized in that, It also includes a guide rail (230) disposed on the lower module (200) for guiding the sliding component (400) to move horizontally.

10. The blank holder die according to claim 1, characterized in that, The force-applying component (500) is an elastic component, a pneumatic component, or a hydraulic component.

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